如何解释that first evenings?

有人问: 有这样一句话:

(1)I didn't pretend I loved you that first evenings.

为何用that而不用those?

说话人将这里的first evenings看作了不可分割的一整段时间,故而用that,再如:

(2)I haven't done anything that two weeks.(that two weeks被当作一整段时间)

(3)When will you repay that twenty dollars?(that twenty dollars被看作一整笔款)